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MilliVoltmeterDIY LEAP#327

1 year ago 549
  • Description
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Description

An ATmega328-based millivolt meter based on a design by Scullcom Hobby Electronics. Uses an LTC2400 ADC and LT1019 voltage reference.

I have fabricated the board at OSHPark, built and tested it - all OK! There are a few changes I'd make to the PCB if I did this again - mainly concerning more conventient connector placement.

All the design notes (including code) are available at https://github.com/tardate/LittleArduinoProjects/tree/master/Equipment/MilliVoltmeterDIY/CustomBoardAndEnclosure

Documents

schematic

pcb

BOM

ID Name Designator Footprint Quantity
1 ATMEGA328P-AU U1 TQFP-32_7X7X08P 1
2 LT1019CS8-2.5PBF U2 SOIC-8 1
3 LTC2400CS8PBF U3 SOIC-8 1
4 100K R1,R3 R0805 2
5 1M R2 R0805 1
6 220K R4 R0805 1
7 10K R12,R11,R10,R8,R9 R0805 5
8 10uF C1,C6 ELECTRO-SMD-A-3.8MM 2
9 100nF C2,C7,C10 0805 3
10 10nF C3,C8 0805 2
11 100uH L1 0805 1
12 16MHZ X1 OSC-49S-1 1
13 22pF C4,C5 C0805 2
14 AMS1117-5.0 U7 SOT-223 1
15 Header-Female-2.54_1x2 P1,P4,P6 HDR-1X2/2.54 3
16 HDR-IDC-2.54-2X3P P2 HDR-IDC-2.54-2X3P 1
17 10Ω R5,R6 0805 2
18 1uF C9 0805 1
19 220Ω R7 0805 1
20 10K PR1 RM065-V1 1
21 Header-Male-2.54_1x3 P3 HDR-3X1/2.54 1
22 Header-Female-2.54_1x10 P5 HDR-10X1/2.54 1
23 Header-Female-2.54_1x4 P7,P9 HDR-4X1/2.54 2
24 2.2uF C9-ALT CAP-D5.0XF2.0 1

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